The_Sarge Posted May 18, 2018 Share Posted May 18, 2018 My attempt at M101 with the C11 @F/7 with the STT-8300m and Baader filters All images 2x2 binned. 124*300s Lum 20*600s each RGB 21*600s Ha For a total of nearly 24 hours. Processed in Pixinsight. All comments and suggestions welcomed. Sarge. Link to comment Share on other sites More sharing options...
Mark at Beaufort Posted May 18, 2018 Share Posted May 18, 2018 Incredible and brilliant - I really like Sarge Link to comment Share on other sites More sharing options...
Chris Posted May 18, 2018 Share Posted May 18, 2018 Spectacular image! really quite jaw dropping! Link to comment Share on other sites More sharing options...
Stub Mandrel Posted May 18, 2018 Share Posted May 18, 2018 31 minutes ago, The_Sarge said: All comments and suggestions welcomed. I'd give up. You clearly haven't got the hang of this Link to comment Share on other sites More sharing options...
The_Sarge Posted May 18, 2018 Author Share Posted May 18, 2018 2 minutes ago, Stub Mandrel said: I'd give up. You clearly haven't got the hang of this But I persevere nontheless..... Link to comment Share on other sites More sharing options...
vlaiv Posted May 18, 2018 Share Posted May 18, 2018 Superb framing! It produces unique kind of 3D feel to the image - you can almost sense galaxy being tilted in space. Link to comment Share on other sites More sharing options...
MarsG76 Posted May 19, 2018 Share Posted May 19, 2018 That is a amazing image.. over 3000mm FL is fantastic.... what mount are you using? Link to comment Share on other sites More sharing options...
The_Sarge Posted May 19, 2018 Author Share Posted May 19, 2018 24 minutes ago, MarsG76 said: That is a amazing image.. over 3000mm FL is fantastic.... what mount are you using? Mars, I'm using Celestron CGE Pro Mount on a fixed pier in an observatory. Alas the C11 with the 0.7x reducer is only 2000mm focal length and seems ok with PHD2 dialled in. Link to comment Share on other sites More sharing options...
MarsG76 Posted May 19, 2018 Share Posted May 19, 2018 2 minutes ago, The_Sarge said: Mars, I'm using Celestron CGE Pro Mount on a fixed pier in an observatory. Alas the C11 with the 0.7x reducer is only 2000mm focal length and seems ok with PHD2 dialled in. Now everyone knows that I failed maths!! :-/ That CGE Pro is obviously great.... I have a CGEM on a peir and it performs quite good at 2000mm on my 8" SCT so that CGE Pro tracking accuracy has to be very good, I'd assume sub 0.1" RMS since I'm getting 0.39" on the best nights. Link to comment Share on other sites More sharing options...
The_Sarge Posted May 19, 2018 Author Share Posted May 19, 2018 3 minutes ago, MarsG76 said: Now everyone knows that I failed maths!! :-/ That CGE Pro is obviously great.... I have a CGEM on a peir and it performs quite good at 2000mm on my 8" SCT so that CGE Pro tracking accuracy has to be very good, I'd assume sub 0.1" RMS since I'm getting 0.39" on the best nights. It's good but I wouldn't say great. There's a fair amount of backlash and Periodic error. I bought it as part of a deal with the C11 mainly because of the payload capacity. As for RMS on the guiding I get 0.2" as standard. Link to comment Share on other sites More sharing options...
MarsG76 Posted May 19, 2018 Share Posted May 19, 2018 1 minute ago, The_Sarge said: I get 0.2" as standard Very nice. Link to comment Share on other sites More sharing options...
The_Sarge Posted May 19, 2018 Author Share Posted May 19, 2018 All I really did was use the drift align to get my polar alignment to sub 1 arcmin and the run the guiding assistant for 5 mins and do what it told me to. Made a massive improvement to the RMS came down from about 0.6" to around 0.2 -0.25" Always tends to go a bit downhill after the merdian flip. Link to comment Share on other sites More sharing options...
vlaiv Posted May 19, 2018 Share Posted May 19, 2018 11 hours ago, The_Sarge said: All I really did was use the drift align to get my polar alignment to sub 1 arcmin and the run the guiding assistant for 5 mins and do what it told me to. Made a massive improvement to the RMS came down from about 0.6" to around 0.2 -0.25" Always tends to go a bit downhill after the merdian flip. Probably because of backlash, depending if you made your setup east heavy - switching side of pier changes also heavy side. Maybe removable small weight that you add after meridian flip would improve things? Link to comment Share on other sites More sharing options...
Rodd Posted May 19, 2018 Share Posted May 19, 2018 Now that is M101. Excellent Rodd Link to comment Share on other sites More sharing options...
The_Sarge Posted May 19, 2018 Author Share Posted May 19, 2018 6 hours ago, vlaiv said: Probably because of backlash, depending if you made your setup east heavy - switching side of pier changes also heavy side. Maybe removable small weight that you add after meridian flip would improve things? Thanks. I'll look into that more. I do tend to keep it neutral rather than have one side heavy. Sarge. Link to comment Share on other sites More sharing options...
iansmith Posted May 20, 2018 Share Posted May 20, 2018 Great image. Awaiting delivery of .7 reducer for my C11. Cheers, Ian Link to comment Share on other sites More sharing options...
ollypenrice Posted May 20, 2018 Share Posted May 20, 2018 Very good indeed and a great call on the binning. I'm looking very carefully at resolution on M101 at the moment for a magazine article and coming to the conclusion that there are various ways of getting to the same place. Looking carefully at your core I think that it would be extremely hard to do better with 'real world' amateur instruments. Great stuff. Olly Link to comment Share on other sites More sharing options...
The_Sarge Posted May 21, 2018 Author Share Posted May 21, 2018 12 hours ago, ollypenrice said: Very good indeed and a great call on the binning. I'm looking very carefully at resolution on M101 at the moment for a magazine article and coming to the conclusion that there are various ways of getting to the same place. Looking carefully at your core I think that it would be extremely hard to do better with 'real world' amateur instruments. Great stuff. Olly Thanks Olly, Even binned the pixel scale is 1.14"/px which is way beyond the seeing up here in North Yorkshire on the best of nights. It seems the 10hours of luminance subs paid off in the end. It responded well to a bit of deconvolution and a light touch with the unsharp mask. I'm really quite pleased with what has been resolved in the core and the spiral arms. Link to comment Share on other sites More sharing options...
laser_jock99 Posted May 21, 2018 Share Posted May 21, 2018 Super image. Link to comment Share on other sites More sharing options...
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